02-15-2006 01:44 PM - edited 07-04-2021 11:38 AM
Hi,
I am working to deploy a group of 1242AG APs with a 4402-12. I am looking to use LWAPP and run the WC in layer 3 mode with the APs deployed on a different subnet.
I have been trying to allocate an address (and DHCP option 43 for the WC management IP address) via the Cisco IOS DHCP server but so far this has not been successful.
I have been unable to provide the DHCP option 43 to the APs. Below is the configuration I have tried to use.
Router DHCP Config
ip dhcp pool WLAN
network 192.168.1.0 255.255.255.0
Option 43 hex f1:07:c0:2e:a8:2e:01:2e:c8 (TLV = 241 7 192.168.1.200)
.
Can anybody possibly assist me?
Thx. Jon
Solved! Go to Solution.
02-20-2006 03:08 PM
Try this...
ip dhcp pool
network
default-router
dns-server
option 60 ascii "VCI string"
option 43 hex
----------------------------------------
assuming your management interface of 192.168.1.200 TLV
ex: option 43 hex f104c0a801c8 (no colons)
----------------VCI Strings--------------
Cisco Aironet 1130 Series = "Cisco AP c1130"
Cisco Aironet 1240 Series = "Cisco AP c1240"
Cisco Aironet 1200 Series = "Cisco AP c1200"
02-15-2006 02:07 PM
Hi
Is the IP you are putting in the option your ap-manager or management interface?
It should be the management interface.
Additionally, 1000 series APs use a string for this option (apparently) whereas converted 1200s etc use a TLV style option - see this quote from a doc:
======================================
The IP address that should be configured as DHCP option 43 or be resolved from
CISCO-LWAPP-CONTROLLER is the IP address of the controller Management IP address. Consult the
specific documentation for the DHCP or DNS platform for details on configuring these parameters
correctly.
Cisco 1000 series access points use a string format for DHCP option 43, whereas Cisco Aironet access
points use the type-length-value (TLV) format for DHCP option 43. DHCP servers must be programmed
to return the option based on the access points DHCP Vendor Class Identifier (VCI) string (DHCP
option 60).
======================================
TRy adding it as a string if you only have 1000-series..
Aaron
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02-15-2006 03:51 PM
Hi,
Thanks for the quick reply.
I am using the management interface address of the WC.
I am using a 1242AG shipped in LWAPP configuration. The setup documentation appears to indicate I need to use a TLV value.
I have tried using an ascii string however a DHCP debug on the AP would appear to show this approach does not work. I will try this approach again tomorrow.
Jon
02-15-2006 07:32 PM
Captured by Ethereal with WLC management address of 151.102.96.50 TLV format.
Option 43: Vendor-Specific Information (6 bytes)
f1 04 97 66 60 f0
02-16-2006 12:57 AM
Hi
The format should be like this:
The format of the TLV block is:
Type: 0xf1 (decimal 241)
Length: Number of controller IP addresses * 4
Value: List of WLC management interfaces
So I think you have the Type (first bit right), the length wrong, and the iP address right.
Acording to the to text above, you need 04 for length, not 07:
Option 43 hex f1:04:c0:2e:a8:2e:01:2e:c8 (TLV = 241 7 192.168.1.200)
Regards
Aaron
Please rate helpful posts
02-20-2006 07:20 AM
Hi all,
Thx for all your replies. I am afraid to say the problem still persists. I have tried the following configs.
option 43 hex f1:04:c0:a8:01:c8
&
Option 43 hex f1:04:c0:2e:a8:2e:01:2e:c8
Both of these have no affect on the APs even though I can see the option being delivered by a dhcp debug and using ethereal.
Any ideas as I assume this is only a syntax issue?
Jon
02-20-2006 03:08 PM
Try this...
ip dhcp pool
network
default-router
dns-server
option 60 ascii "VCI string"
option 43 hex
----------------------------------------
assuming your management interface of 192.168.1.200 TLV
ex: option 43 hex f104c0a801c8 (no colons)
----------------VCI Strings--------------
Cisco Aironet 1130 Series = "Cisco AP c1130"
Cisco Aironet 1240 Series = "Cisco AP c1240"
Cisco Aironet 1200 Series = "Cisco AP c1200"
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